Hmm. I am not so sure anymore regarding if the new names are appropriate. Here is a list of what it would look like:
Class BH -> Below Average Class (10-C)
Class H -> Human Class (10-B), or Athlete Class (10-A)
Class H+ -> Athlete Class (10-A)
Class KJ -> Street Class (9-C), or Wall Class (9-B)
Class KJ+ -> Wall Class (9-B)
Class MJ -> Room Class/Small Building Class (9-A)
Class MJ+ -> Room Class/Small Building Class (9-A)
Class GJ -> Building Class (8-C), Large Building Class (High 8-C), City Block Class (8-B), or Multi-City Block Class (8-A)
Class GJ+ -> Multi-City Block Class (8-A)
Class TJ -> Multi-City Block Class (8-A), Small Town Class (Low 7-C), Town Class (7-C), or Large Town Class (High 7-C)
Class TJ+ -> Large Town Class (High 7-C)
Class PJ -> Small City Class (Low 7-B), City Class (7-B), or Large City Class/Mountain Class (7-A)
Class PJ+ -> Large City Class/Mountain Class (7-A)
Class EJ -> Large Mountain Class (High 7-A), Island Class (6-C), or Large Island Class (High 6-C)
Class EJ+ -> Large Island Class (High 6-C)
Class ZJ -> Small Country Class (Low 6-B), Country Class (6-B), or Large Country Class/Small Continent Class (High 6-B)
Class ZJ+ -> Large Country Class/Small Continent Class (High 6-B)
Class YJ -> Large Country Class/Low Continental Class (High 6-B), or Continental Class (6-A)
Class YJ+ -> Continental Class (6-A)
Class NJ -> Large Continental Class/Multi-Continental Class (High 6-A), or Lunar Class (5-C)
Class NJ+ -> Lunar Class (5-C)
Class XJ -> Lunar Class (5-C), Low Planetary Class (Low 5-B), or Planetary Class (5-B)
Class XJ+ -> Planetary Class (5-B)
Class XKJ -> Planetary Class (5-B), or Large Planetary Class (5-A)
Class XKJ+ - > Large Planetary Class (5-A)
Class XMJ -> Large Planetary Class (5-A)
Class XMJ+ -> Large Planetary Class (5-A)
Class XGJ -> Large Planetary Class (5-A), Dwarf Star Class (High 5-A), Low Stellar Class (Low 4-C), or Stellar Class (4-C)
Class XGJ+ -> Stellar Class (4-C)
Class XTJ -> Large Stellar Class (High 4-C), or Solar System Class (4-B)
Class XTJ+ -> Solar System Class (4-B)
Class XPJ -> Solar System Class (4-B)
Class XPJ+ -> Solar System Class (4-B)